Distribution and Growth of Juvenile Pink Salmon in the Coastal Waters of Eastern Hokkaido Determined with Otolith-Marking
In Hokkaido, northern Japan, although relatively constant numbers (approximately 140 million fish) of hatchery pink salmon juveniles have been released annually since the 1990s, even and odd year catches of pink salmon in coastal fisheries consistently differ. The reason(s) for this interannual patt...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.513.4698 2023-05-15T17:52:41+02:00 Distribution and Growth of Juvenile Pink Salmon in the Coastal Waters of Eastern Hokkaido Determined with Otolith-Marking Hiroki Asami Mitsuhiro Nagata The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.513.4698 http://www.npafc.org/new/publications/Technical Report/TR7/Fujiwara.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.513.4698 http://www.npafc.org/new/publications/Technical Report/TR7/Fujiwara.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.npafc.org/new/publications/Technical Report/TR7/Fujiwara.pdf Distribution growth pink salmon otolith-marking All correspondence should be addressed to M. Fujiwara text ftciteseerx 2016-01-08T09:45:41Z In Hokkaido, northern Japan, although relatively constant numbers (approximately 140 million fish) of hatchery pink salmon juveniles have been released annually since the 1990s, even and odd year catches of pink salmon in coastal fisheries consistently differ. The reason(s) for this interannual pattern is unknown. There is little consistently gathered information on the ecology and status of pink salmon in Hokkaido although Morita et al. (2005) documented their population structure. It has been suggested that ocean conditions can limit salmon production and high mortality occurs during their early sea life (Parker, 1968; Mortensen et al. 2000). Consequently, we wished to improve our understanding of the early marine ecology of juvenile pink salmon with respect to their offshore movement and growth. We monitored the distribution and growth of juvenile pink salmon and environmental conditions off the Abashiri coast of the Okhotsk Sea beginning in 2002 (Ando et al. 2005). Four transects were established (A–D; Fig. 1), each with three sampling sites 1 km, 4 km, and 7 km from the shore. Sampling occurred every ten days from late April to early July, 2002–2005. In coastal waters, we captured juvenile pink salmon using a surface trawl net pulled by two boats. We also beach seined littoral waters (St. E; Fig. 1) starting in 2003. Because juvenile pink salmon captured in the coastal or littoral waters of the Abashiri coast might include hatchery-origin fish released from several sites as well as naturally spawned fish, we designed an otolith-marking experiment in 2005 to survey the distribution and growth of juveniles of known origin. Of the 17.2 Text okhotsk sea Pink salmon Unknown Okhotsk |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
topic |
Distribution growth pink salmon otolith-marking All correspondence should be addressed to M. Fujiwara |
spellingShingle |
Distribution growth pink salmon otolith-marking All correspondence should be addressed to M. Fujiwara Hiroki Asami Mitsuhiro Nagata Distribution and Growth of Juvenile Pink Salmon in the Coastal Waters of Eastern Hokkaido Determined with Otolith-Marking |
topic_facet |
Distribution growth pink salmon otolith-marking All correspondence should be addressed to M. Fujiwara |
description |
In Hokkaido, northern Japan, although relatively constant numbers (approximately 140 million fish) of hatchery pink salmon juveniles have been released annually since the 1990s, even and odd year catches of pink salmon in coastal fisheries consistently differ. The reason(s) for this interannual pattern is unknown. There is little consistently gathered information on the ecology and status of pink salmon in Hokkaido although Morita et al. (2005) documented their population structure. It has been suggested that ocean conditions can limit salmon production and high mortality occurs during their early sea life (Parker, 1968; Mortensen et al. 2000). Consequently, we wished to improve our understanding of the early marine ecology of juvenile pink salmon with respect to their offshore movement and growth. We monitored the distribution and growth of juvenile pink salmon and environmental conditions off the Abashiri coast of the Okhotsk Sea beginning in 2002 (Ando et al. 2005). Four transects were established (A–D; Fig. 1), each with three sampling sites 1 km, 4 km, and 7 km from the shore. Sampling occurred every ten days from late April to early July, 2002–2005. In coastal waters, we captured juvenile pink salmon using a surface trawl net pulled by two boats. We also beach seined littoral waters (St. E; Fig. 1) starting in 2003. Because juvenile pink salmon captured in the coastal or littoral waters of the Abashiri coast might include hatchery-origin fish released from several sites as well as naturally spawned fish, we designed an otolith-marking experiment in 2005 to survey the distribution and growth of juveniles of known origin. Of the 17.2 |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Hiroki Asami Mitsuhiro Nagata |
author_facet |
Hiroki Asami Mitsuhiro Nagata |
author_sort |
Hiroki Asami |
title |
Distribution and Growth of Juvenile Pink Salmon in the Coastal Waters of Eastern Hokkaido Determined with Otolith-Marking |
title_short |
Distribution and Growth of Juvenile Pink Salmon in the Coastal Waters of Eastern Hokkaido Determined with Otolith-Marking |
title_full |
Distribution and Growth of Juvenile Pink Salmon in the Coastal Waters of Eastern Hokkaido Determined with Otolith-Marking |
title_fullStr |
Distribution and Growth of Juvenile Pink Salmon in the Coastal Waters of Eastern Hokkaido Determined with Otolith-Marking |
title_full_unstemmed |
Distribution and Growth of Juvenile Pink Salmon in the Coastal Waters of Eastern Hokkaido Determined with Otolith-Marking |
title_sort |
distribution and growth of juvenile pink salmon in the coastal waters of eastern hokkaido determined with otolith-marking |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.513.4698 http://www.npafc.org/new/publications/Technical Report/TR7/Fujiwara.pdf |
geographic |
Okhotsk |
geographic_facet |
Okhotsk |
genre |
okhotsk sea Pink salmon |
genre_facet |
okhotsk sea Pink salmon |
op_source |
http://www.npafc.org/new/publications/Technical Report/TR7/Fujiwara.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.513.4698 http://www.npafc.org/new/publications/Technical Report/TR7/Fujiwara.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766160391005536256 |